This seven-volume set, LNCS 16541-16547, constitutes the proceedings of the 45th Annual International Conference on the Theory and Applications of Cryptographic Techniques, EUROCRYPT 2026, held in Rome, Italy, during May 10–14, 2026. The 142 papers included in these proceedings were carefully reviewed and selected from 675 submissions. They are organized in topical sections as follows:Part I: Signatures; Quantum CryptographyPart II: Applied CryptographyPart III: Multi-Party ComputationPart IV: Post-Quantum CryptographyPart V: FoundationsPart VI: Symmetric Cryptography and Related TechniquesPart VII: Zero-Knowledge; Hardware and Embedded Systems